Use the same pattern of cyclic.Decoders as cyclic.Encoders, otherwise object maps don't match

Change-Id: I80822bf2ce233398cf3a9c07b267ef58f0f6c70a
diff --git a/database/store/small.go b/database/store/small.go
index 1e2d18c..504893d 100644
--- a/database/store/small.go
+++ b/database/store/small.go
@@ -79,10 +79,10 @@
 	records := make(map[binary.ID][]byte)
 
 	// Use a buffered reader to quickly read the archive records
-	d := cyclic.Decoder(vle.Reader(bufio.NewReaderSize(data, 256<<10)))
+	reader := vle.Reader(bufio.NewReaderSize(data, 256<<10))
 	for {
 		r := &keyValue{}
-		if err := d.Value(r); err != io.EOF {
+		if err := cyclic.Decoder(reader).Value(r); err != io.EOF {
 			if err != nil {
 				panic(err)
 			}
@@ -181,7 +181,7 @@
 	go func() {
 		// Output records using buffered IO.
 		writer := bufio.NewWriterSize(compacting, 256<<10)
-		e := cyclic.Encoder(vle.Writer(writer))
+		w := vle.Writer(writer)
 
 		size := 0
 		waste := 0
@@ -202,7 +202,7 @@
 				waste += prevSize
 			}
 
-			err := e.Value(insert)
+			err := cyclic.Encoder(w).Value(insert)
 			if err != nil {
 				panic(err)
 			}
@@ -226,7 +226,7 @@
 		}
 
 		for _, record := range recordsCopyArray {
-			err := e.Value(record)
+			err := cyclic.Encoder(w).Value(record)
 			if err != nil {
 				panic(err)
 			}
@@ -383,8 +383,7 @@
 			buffer: data,
 		}
 
-		e := cyclic.Encoder(vle.Writer(s.data))
-		err := e.Value(record)
+		err := cyclic.Encoder(vle.Writer(s.data)).Value(record)
 		if err != nil {
 			panic(err)
 		}
diff --git a/database/store/unbounded_archive.go b/database/store/unbounded_archive.go
index 60ff31d..fe7b17a 100644
--- a/database/store/unbounded_archive.go
+++ b/database/store/unbounded_archive.go
@@ -53,10 +53,10 @@
 	records := make(map[binary.ID]span)
 
 	// Use a buffered reader to quickly read the active records
-	d := cyclic.Decoder(vle.Reader(bufio.NewReaderSize(index, 256<<10)))
+	reader := vle.Reader(bufio.NewReaderSize(index, 256<<10))
 	for {
 		var r record
-		if err := r.decode(d); err != io.EOF {
+		if err := r.decode(cyclic.Decoder(reader)); err != io.EOF {
 			if err != nil {
 				panic(err)
 			}